function greeter(person: string) {
  return "Hello, " + person
}

let user = "Jane User"

// 数组
const numArr1: Array<number> = [1, 2, 3, 4, 5]
const numArr2: number[] = [1, 2, 3, 4, 5]
const numArr3: any[] = [1, 2, 3, 4]

document.body.innerHTML = greeter(user)
